1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Ported to LTP: Wayne Boyer
5 * Copyright (c) 2017 Fujitsu Ltd.
6 * 04/2017 Modified by Jinhui Huang
7 */
8 /*
9 * DESCRIPTION
10 * test 1:
11 * Read with an invalid file descriptor, and expect an EBADF.
12 *
13 * test 2:
14 * The parameter passed to read is a directory, check if the errno is
15 * set to EISDIR.
16 *
17 * test 3:
18 * Buf is outside the accessible address space, expect an EFAULT.
19 *
20 * test 4:
21 * The file was opened with the O_DIRECT flag, and transfer sizes was not
22 * multiples of the logical block size of the file system, expect an
23 * EINVAL.
24 *
25 * test 5:
26 * The file was opened with the O_DIRECT flag, and the alignment of the
27 * user buffer was not multiples of the logical block size of the file
28 * system, expect an EINVAL.
29 */
30
31 #define _GNU_SOURCE
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <errno.h>
36 #include "tst_test.h"
37
38 static int badfd = -1;
39 static int fd2, fd3, fd4 = -1;
40 static char buf[BUFSIZ];
41 static void *bufaddr = buf;
42 static void *outside_buf = (void *)-1;
43 static void *addr4;
44 static void *addr5;
45 static long fs_type;
46
47 static struct tcase {
48 int *fd;
49 void **buf;
50 size_t count;
51 int exp_error;
52 } tcases[] = {
53 {&badfd, &bufaddr, 1, EBADF},
54 {&fd2, &bufaddr, 1, EISDIR},
55 {&fd3, &outside_buf, 1, EFAULT},
56 {&fd4, &addr4, 1, EINVAL},
57 {&fd4, &addr5, 4096, EINVAL},
58 };
59
verify_read(unsigned int n)60 static void verify_read(unsigned int n)
61 {
62 struct tcase *tc = &tcases[n];
63
64 if (tc->fd == &fd4 && *tc->fd == -1) {
65 tst_res(TCONF, "O_DIRECT not supported on %s filesystem",
66 tst_fs_type_name(fs_type));
67 return;
68 }
69
70 TEST(read(*tc->fd, *tc->buf, tc->count));
71
72 if (*tc->fd == fd4 && TST_RET >= 0) {
73 tst_res(TPASS,
74 "O_DIRECT unaligned reads fallbacks to buffered I/O");
75 return;
76 }
77
78 if (TST_RET != -1) {
79 tst_res(TFAIL, "read() succeeded unexpectedly");
80 return;
81 }
82
83 if (TST_ERR == tc->exp_error) {
84 tst_res(TPASS | TTERRNO, "read() failed as expected");
85 } else {
86 tst_res(TFAIL | TTERRNO, "read() failed unexpectedly, "
87 "expected %s", tst_strerrno(tc->exp_error));
88 }
89 }
90
setup(void)91 static void setup(void)
92 {
93 fd2 = SAFE_OPEN(".", O_DIRECTORY);
94
95 SAFE_FILE_PRINTF("test_file", "A");
96
97 fd3 = SAFE_OPEN("test_file", O_RDWR);
98
99 outside_buf = SAFE_MMAP(0, 1, PROT_NONE,
100 MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
101
102 addr4 = SAFE_MEMALIGN(getpagesize(), (4096 * 10));
103 addr5 = addr4 + 1;
104
105 fs_type = tst_fs_type(".");
106 if (fs_type != TST_TMPFS_MAGIC)
107 fd4 = SAFE_OPEN("test_file", O_RDWR | O_DIRECT);
108 }
109
cleanup(void)110 static void cleanup(void)
111 {
112 free(addr4);
113
114 if (fd4 > 0)
115 SAFE_CLOSE(fd4);
116
117 if (fd3 > 0)
118 SAFE_CLOSE(fd3);
119
120 if (fd2 > 0)
121 SAFE_CLOSE(fd2);
122 }
123
124 static struct tst_test test = {
125 .tcnt = ARRAY_SIZE(tcases),
126 .test = verify_read,
127 .setup = setup,
128 .cleanup = cleanup,
129 .needs_tmpdir = 1,
130 };
131